/*
 * Copyright (C) 2005 - 2013 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008 - 2013 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010 - 2013 ProjectSkyfire <http://www.projectskyfire.org/>
 *
 * Copyright (C) 2011 - 2013 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _PREPAREDSTATEMENT_H
#define _PREPAREDSTATEMENT_H

#include "SQLOperation.h"
#include <ace/Future.h>

//- Union for data buffer (upper-level bind -> queue -> lower-level bind)
union PreparedStatementDataUnion {
	bool boolean;
	uint8 ui8;
	int8 i8;
	uint16 ui16;
	int16 i16;
	uint32 ui32;
	int32 i32;
	uint64 ui64;
	int64 i64;
	float f;
	double d;
};

//- This enum helps us differ data held in above union
enum PreparedStatementValueType {
	TYPE_BOOL,
	TYPE_UI8,
	TYPE_UI16,
	TYPE_UI32,
	TYPE_UI64,
	TYPE_I8,
	TYPE_I16,
	TYPE_I32,
	TYPE_I64,
	TYPE_FLOAT,
	TYPE_DOUBLE,
	TYPE_STRING
};

struct PreparedStatementData {
	PreparedStatementDataUnion data;
	PreparedStatementValueType type;
	std::string str;
};

//- Forward declare
class MySQLPreparedStatement;

//- Upper-level class that is used in code
class PreparedStatement {
	friend class PreparedStatementTask;
	friend class MySQLPreparedStatement;
	friend class MySQLConnection;

public:
	explicit PreparedStatement(uint32 index);
	~PreparedStatement();

	void setBool(const uint8 index, const bool value);
	void setUInt8(const uint8 index, const uint8 value);
	void setUInt16(const uint8 index, const uint16 value);
	void setUInt32(const uint8 index, const uint32 value);
	void setUInt64(const uint8 index, const uint64 value);
	void setInt8(const uint8 index, const int8 value);
	void setInt16(const uint8 index, const int16 value);
	void setInt32(const uint8 index, const int32 value);
	void setInt64(const uint8 index, const int64 value);
	void setFloat(const uint8 index, const float value);
	void setDouble(const uint8 index, const double value);
	void setString(const uint8 index, const std::string& value);

protected:
	void BindParameters();

protected:
	MySQLPreparedStatement* m_stmt;
	uint32 m_index;
	std::vector<PreparedStatementData> statement_data; //- Buffer of parameters, not tied to MySQL in any way yet
};

//- Class of which the instances are unique per MySQLConnection
//- access to these class objects is only done when a prepared statement task
//- is executed.
class MySQLPreparedStatement {
	friend class MySQLConnection;
	friend class PreparedStatement;

public:
	MySQLPreparedStatement(MYSQL_STMT* stmt);
	~MySQLPreparedStatement();

	void setBool(const uint8 index, const bool value);
	void setUInt8(const uint8 index, const uint8 value);
	void setUInt16(const uint8 index, const uint16 value);
	void setUInt32(const uint8 index, const uint32 value);
	void setUInt64(const uint8 index, const uint64 value);
	void setInt8(const uint8 index, const int8 value);
	void setInt16(const uint8 index, const int16 value);
	void setInt32(const uint8 index, const int32 value);
	void setInt64(const uint8 index, const int64 value);
	void setFloat(const uint8 index, const float value);
	void setDouble(const uint8 index, const double value);
	void setString(const uint8 index, const char* value);

protected:
	MYSQL_STMT* GetSTMT() {
		return m_Mstmt;
	}
	MYSQL_BIND* GetBind() {
		return m_bind;
	}
	PreparedStatement* m_stmt;
	void ClearParameters();
	bool CheckValidIndex(uint8 index);
	std::string getQueryString(const char *query);

private:
	void setValue(MYSQL_BIND* param, enum_field_types type, const void* value,
			uint32 len, bool isUnsigned);

private:
	MYSQL_STMT* m_Mstmt;
	uint32 m_paramCount;
	std::vector<bool> m_paramsSet;
	MYSQL_BIND* m_bind;
};

typedef ACE_Future<PreparedQueryResult> PreparedQueryResultFuture;

//- Lower-level class, enqueuable operation
class PreparedStatementTask: public SQLOperation {
public:
	PreparedStatementTask(PreparedStatement* stmt);
	PreparedStatementTask(PreparedStatement* stmt,
			PreparedQueryResultFuture result);
	~PreparedStatementTask();

	bool Execute();

protected:
	PreparedStatement* m_stmt;
	bool m_has_result;
	PreparedQueryResultFuture m_result;
};
#endif
